CN111394615A - Medical high-performance TA3G pure titanium plate and preparation method thereof - Google Patents
Medical high-performance TA3G pure titanium plate and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C14/00—Alloys based on titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/006—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
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- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
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Abstract
The embodiment of the invention provides a medical high-performance TA3G pure titanium plate and a preparation method thereof, the plate prepared by the method has the advantages of high performance, good consistency, high surface quality, high dimensional precision and high production efficiency, the manufacturing cost of the plate is far lower than that of a plate processed by traditional sheet rolling, and the method is a revolution for processing the medical high-performance TA3G pure titanium plate.
Description
Technical Field
The invention belongs to the technical field of preparation methods of medical titanium plates, and particularly relates to a medical high-performance TA3G pure titanium plate and a preparation method thereof.
Background
The traditional pure titanium plate is rolled in a sheet mode, multiple fire times of hot rolling and cold rolling are needed, the polishing of the middle fire times and the plate edge cutting loss are large, the production efficiency is low, the production cost is high, and the capacity is limited.
Titanium, especially titanium alloy, because its deformation plasticity is relatively poor, it is difficult to realize the hot working of the super large deflection, for pure titanium plate, adopt the traditional sheet type rolling processing way, the thermoplastic capacity limit of single fire is no more than 85% generally, have greatly limited the high-efficient acquisition panel, and the panel surface quality that the traditional sheet type produces is general, there are surface pit, pocking mark phenomenon mostly, the thickness tolerance is large, for the medical high-precision requirement TA3G pure titanium plate, its loss of the follow-up finishing processing is large, with low efficiency, with high costs, unsuitable for the large-batch industrial production.
In order to solve the problems, the invention introduces roll-type rolling, and adopts ultra-large deformation roll-type hot rolling and roll-type cold rolling to prepare the medical TA3G pure titanium plate with high performance, high surface quality and high dimensional accuracy.
Disclosure of Invention
In order to solve the technical problems, the invention provides a medical high-performance TA3G pure titanium plate and a preparation method thereof, and the technical problems to be solved by the invention are realized by the following technical scheme:
the embodiment of the invention provides a preparation method of a medical high-performance TA3G pure titanium plate, which comprises the following steps:
and obtaining a titanium plate blank.
Heating the titanium plate blank to obtain a heated titanium plate blank; wherein the heating temperature is 850-900 ℃, and the heating duration is 220-240 min.
And rolling the heated titanium plate blank to obtain a hot-rolled coil, wherein the thickness of the hot-rolled coil ranges from 4mm to 10mm, and the width of the hot-rolled coil is 1220 mm.
And uncoiling, online annealing, online shot blasting and pickling and coiling the hot rolled coil to obtain a pickled hot rolled coil blank. Wherein the temperature of the on-line annealing is 700-750 ℃, and the annealing time is 20-30 min.
And uncoiling, cutting to length, leveling under ground furnace pressure and finishing the surface of the acid-washing hot-rolled coil blank to obtain a finished product of the hot-rolled and annealed finish-polished plate.
And rolling the acid-washing hot-rolled coil blank by using a coil cold rolling mill to obtain a cold-rolled coil, wherein the thickness range of the cold-rolled coil is 1-4mm, and the width of the cold-rolled coil is 1220 mm.
Uncoiling, online annealing, online shot blasting pickling and coiling the cold-rolled coil to obtain a pickled cold-rolled coil blank; wherein the temperature of the on-line annealing is 700-750 ℃, and the annealing time is 20-30 min.
And uncoiling, cutting to length, leveling under ground furnace pressure and finishing the surface of the acid-washed cold-rolled coil blank to obtain a finished product of the cold-rolled annealed finish-polished plate.
And the finished product of the hot-rolled annealed finish-polished plate or the finished product of the cold-rolled annealed finish-polished plate is the pure titanium plate.
Optionally, obtaining the titanium plate blank comprises:
obtaining 0-grade titanium sponge; wherein, in the 0-grade sponge titanium, C is less than or equal to 0.03 wt%, and N is less than or equal to 0.01 wt%.
Obtaining an addition raw material; the raw material addition comprises the following steps: TiO22And TiFe30
Adding TiO into the 0-grade titanium sponge2The addition criterion is the weight percentage of oxygen in the titanium sponge grade 0 in the range of (0.13-0.18) wt%.
TiFe30 is added to the grade 0 titanium sponge, with the addition being based on the weight percent of iron in the grade 0 titanium sponge being in the range of (0.15-0.20) wt%. To obtain the mixed raw material.
And carrying out twice vacuum consumable melting on the mixed raw materials to obtain an ingot.
And forging and machining the cast ingot to obtain a titanium plate blank.
Optionally, the thickness of the titanium plate blank is 200mm, the width is 1220mm, and the length is 7000 mm.
Optionally, rolling the heat-treated titanium plate to obtain a hot-rolled coil includes:
and carrying out primary rolling on the heat-treated titanium plate by using a roll type hot rolling mill to obtain a primary rolling piece, wherein the thickness of the primary rolling piece is 60-70mm, the width of the primary rolling piece is 1220, and the length of the primary rolling piece is 7000.
Carrying out secondary rolling on the primary rolled piece through a roll type hot rolling mill, and in the process of the secondary rolling, utilizing an online temperature compensation device to compensate the temperature of the inlet side of the roll type hot rolling mill; and after the second rolling is finished, obtaining the hot rolled coil.
Optionally, the surface finishing processing steps include flat grinding, sanding and polishing.
Optionally, the step of sequentially performing flat grinding, sanding and polishing on the acid-washed cold-rolled coil blank subjected to the leveling by the pressure of the ground furnace comprises the following steps:
the vacuum chuck is fixed on the flat grinding reference platform in advance, the upper reference surface of the vacuum chuck is ensured to be kept horizontal, and the vacuum sealing rubber strips are laid in the field character lattice gap belt of the upper reference surface of the chuck in a rectangular circle according to the size close to the length and the width of the plate.
And placing the acid-washed cold-rolled coil blank subjected to pressure leveling in the ground furnace on the reference surface of a vacuum chuck, ensuring that the sealing rubber strips are completely covered, keeping four sides equidistant, starting the vacuum chuck to work, evacuating to the maximum adsorption force, and completely and tightly adsorbing the acid-washed cold-rolled coil blank subjected to pressure leveling in the ground furnace and the reference surface.
Starting a flat grinding grinder to work, carrying out flat grinding cutting processing on the surface of the acid-washing cold-rolled coil blank subjected to the leveling by the aid of a grinding wheel, and ensuring that the actual grinding amount of each flat grinding of each surface of the acid-washing cold-rolled coil blank subjected to the leveling by the aid of the ground furnace pressure is consistent according to consumption rates of different materials, wherein the grinding amount is 0.3-0.4mm, the single grinding amount is 0.04mm, the grinding frequency is not more than 10 times, and the grinding speed is 1 min/time, so that the cold-rolled coil blank subjected to the flat grinding is obtained.
And adjusting the clearance of the abrasive belt machine to the thickness of the pure titanium plate in advance.
Sanding is sequentially carried out according to the sequence of (240 meshes-320 meshes) - (400 meshes-600 meshes) - (800 meshes-1000 meshes) - (1200 meshes-2000 meshes), each surface of the cold-rolled coil blank after flat grinding is sanded twice by adopting the same abrasive belt, and the sanding standard is as follows: the surface smoothness reaches Ra less than or equal to 0.3 mu m.
The medical high-performance TA3G pure titanium plate is prepared by the preparation method of the medical high-performance TA3G pure titanium plate, wherein the medical high-performance TA3G pure titanium plate is a finished product of a hot-rolled annealed finish-polished plate or a finished product of a cold-rolled annealed finish-polished plate.
Compared with the prior art, the invention has the beneficial effects that:
1. and (3) hot rolling: although the method is characterized in that the coiling hot rolling is carried out by using a traditional stainless steel plate rolling mill, the thermoplastic processing temperature range of titanium is considered to be narrow, in order to prevent the problem of rolling tearing caused by the temperature drop of the surface of a plate in the rolling and thinning process, a temperature compensation device is additionally arranged on the inlet side of the hot rolling mill, the temperature parameter setting is consistent with the heating temperature, when the plate is rolled and thinned to about 1/3 of the thickness of an original plate blank, the temperature compensation device is positioned on a coiling platform through a mechanical lifting device, the temperature compensation is carried out through the temperature compensation device when the coiling is rolled back and forth, the dynamic elimination of processing hardening is realized, the plastic lifting of the material is realized, the thermoplastic rolling deformation is continuously realized, the actual maximum hot rolling plastic deformation of the TA3G pure titanium plate can reach 98 percent. A4-10 mm coiled belt can be obtained by hot rolling a plate blank with the thickness of 200mm with one heating, the one-heating forming efficiency is high, the processing loss is extremely low, the heating loss is about 0.5 percent, the comprehensive yield is improved by 5 percent compared with the traditional sheet type rolling, and the processing cost is greatly reduced.
2. The plate is subjected to heat treatment by adopting on-line annealing, the TA3G pure titanium plate can obtain completely consistent grain size and mechanical property at the head and the tail, the consistency of the internal quality of the product is ensured, and the problem that the traditional stacking type annealing can not be completely annealed uniformly is avoided.
3. The annealed coil after hot rolling or cold rolling has good surface quality and small thickness tolerance range with the coil, the thickness tolerance of a hot-rolled coil of 4-10mm can be controlled within 0.2mm, the thickness tolerance of a cold-rolled coil of 1-4mm can be controlled within 0.1mm, and the plate tolerance band is improved by 1 time compared with that of a traditional sheet type rolling mode; the rolled tape blank of the small-thickness tolerance belt can be subjected to uncoiling, sizing, cutting, blanking, pressure leveling and finishing processing to obtain a medical TA3G pure titanium plate finished product with high performance and high surface quality.
In conclusion, the plate prepared by the method has high performance and consistency, high surface quality, high dimensional precision and high production efficiency, and the cost is far lower than that of the plate processed by the traditional sheet rolling, and the method is a revolution for processing the medical high-performance TA3G pure titanium plate.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and examples.
FIG. 1 is a flow chart of a method for preparing a medical high-performance TA3G pure titanium plate according to an embodiment of the present invention;
FIG. 2 is a longitudinal section metallographic phase diagram 2(a) and a cross section metallographic phase diagram 2(b) of a rolled 6.0TA3G pure titanium plate provided by an embodiment of the invention;
fig. 3 is a longitudinal section metallographic image 3(a) and a cross section metallographic image 3(b) of a conventional sheet type roll-processed 6.0TA3G pure titanium plate provided by an embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Please refer to fig. 1. The embodiment of the invention provides a preparation method of a medical high-performance TA3G pure titanium plate, which comprises the following steps:
and S110, obtaining the titanium plate blank.
S120, heating the titanium plate blank to obtain a heated titanium plate blank; wherein the heating temperature is 850-900 ℃, and the heating duration is 220-240 min.
S130, rolling the heated titanium plate blank to obtain a hot-rolled coil, wherein the thickness range of the hot-rolled coil is 4-10mm, and the width of the hot-rolled coil is 1220 mm.
Specifically, the heat-treated titanium plate is rolled, although coiling hot rolling is carried out by using a traditional stainless steel plate rolling mill, the narrow thermoplastic processing temperature range of titanium is considered, in order to prevent the problem of rolling tearing caused by the temperature drop of the surface of the plate in the rolling and thinning process, a temperature compensation device is additionally arranged on the inlet side of a hot rolling mill, the temperature parameter setting is consistent with the heating temperature, when the plate is rolled and thinned to about 1/3 of the thickness of an original plate blank, the temperature compensation device is positioned on a coiling platform through a mechanical lifting device, the temperature compensation is carried out through the temperature compensation device when the coiling is rolled back and forth, the dynamic elimination of processing hardening is realized, the plastic lifting of the material is carried out, the thermoplastic rolling deformation is continuously realized, the actual maximum hot rolling plastic deformation amount of the TA3G pure titanium plate can reach 98%, the ultra-plastic processing deformation can. A4-10 mm coiled belt can be obtained by hot rolling a plate blank with the thickness of 200mm with one heating, the one-heating forming efficiency is high, the processing loss is extremely low, the heating loss is about 0.5 percent, the comprehensive yield is improved by 5 percent compared with the traditional sheet type rolling, and the processing cost is greatly reduced.
S140, uncoiling, online annealing, online shot blasting and pickling and coiling the hot rolled coil to obtain a pickled hot rolled coil blank; wherein the temperature of the on-line annealing is 700-750 ℃, and the annealing time is 20-30 min;
s150, uncoiling, cutting to length, leveling in a ground furnace pressure mode and finishing surface processing are carried out on the acid-washing hot-rolled coil blank to obtain a finished product of a hot-rolled and annealed finish-cast plate.
And S160, rolling the acid-washing hot-rolled coil blank by using a coil type cold rolling mill to obtain a cold-rolled coil, wherein the thickness range of the cold-rolled coil is 1-4mm, and the width of the cold-rolled coil is 1220 mm.
S170, uncoiling, online annealing, online shot blasting pickling and coiling the cold-rolled coil to obtain a pickled cold-rolled coil blank; wherein the temperature of the on-line annealing is 700-750 ℃, and the annealing time is 20-30 min.
S180, uncoiling, cutting to length, leveling in a ground furnace pressure mode and finishing surface processing are carried out on the acid-washing cold-rolled coil blank to obtain a finished product of a cold-rolled and annealed finish-polished plate.
And S190, obtaining the finished product of the hot-rolled annealed finish-polished plate or the finished product of the cold-rolled annealed finish-polished plate as a pure titanium plate.
Further, obtaining the titanium plate blank comprises:
and obtaining the grade 0 titanium sponge. Wherein, in the 0-grade sponge titanium, C is less than or equal to 0.03wt percent, and N is less than or equal to 0.01wt percent;
and (5) obtaining an addition raw material. The raw material addition comprises the following steps: TiO22And TiFe30
Adding TiO into the 0-grade titanium sponge2The addition criterion is the weight percentage of oxygen in the titanium sponge grade 0 in the range of (0.13-0.18) wt%.
Adding TiFe30 into the grade 0 titanium sponge, wherein the addition standard is that the weight percentage of iron in the grade 0 titanium sponge is in the range of (0.15-0.20) wt%, and obtaining a mixed raw material.
And carrying out twice vacuum consumable melting on the mixed raw materials to obtain an ingot.
And forging and machining the cast ingot to obtain a titanium plate blank.
Specifically, the invention introduces a large-deformation continuous rolling processing pure titanium plate. In order to solve the problem of hot working with ultra-large deformation and the requirement of obtaining high strength and high plasticity (the tensile strength Rm is more than or equal to 500MPa and the elongation A is more than or equal to 20%) of a medical TA3G pure titanium plate, elements of TA3G pure titanium are specially designed, the microalloying regulation of O and Fe is mainly realized, and the grade of sponge titanium used as a raw material of a TA3G pure titanium cast ingot and the content of impurities C, N are limited, which is the key point that the TA3G pure titanium plate can realize the roll-type rolling with ultra-large deformation.
Further, the thickness of the titanium plate blank is 200mm, the width is 1220mm, and the length is 7000 mm.
Further, rolling the heat-treated titanium plate to obtain a hot-rolled coil includes:
and carrying out primary rolling on the heat-treated titanium plate by using a roll type hot rolling mill to obtain a primary rolling piece, wherein the thickness of the primary rolling piece is 60-70mm, the width of the primary rolling piece is 1220, and the length of the primary rolling piece is 7000.
Carrying out secondary rolling on the primary rolled piece through a roll type hot rolling mill, and in the process of the secondary rolling, utilizing an online temperature compensation device to compensate the temperature of the inlet side of the roll type hot rolling mill; and after the second rolling is finished, obtaining the hot rolled coil.
Further, the surface finishing processing steps comprise flat grinding, sanding and polishing.
Further, the steps of sequentially performing flat grinding, sanding and polishing on the acid-washed cold-rolled coil blank subjected to the leveling by the ground furnace pressure comprise the following steps:
the vacuum chuck is fixed on the flat grinding reference platform in advance, the upper reference surface of the vacuum chuck is ensured to be kept horizontal, and the vacuum sealing rubber strips are laid in the field character lattice gap belt of the upper reference surface of the chuck in a rectangular circle according to the size close to the length and the width of the plate.
And placing the acid-washed cold-rolled coil blank subjected to pressure leveling in the ground furnace on the reference surface of a vacuum chuck, ensuring that the sealing rubber strips are completely covered, keeping four sides equidistant, starting the vacuum chuck to work, evacuating to the maximum adsorption force, and completely and tightly adsorbing the acid-washed cold-rolled coil blank subjected to pressure leveling in the ground furnace and the reference surface.
Starting a flat grinding grinder to work, carrying out flat grinding cutting processing on the surface of the acid-washing cold-rolled coil blank subjected to the leveling by the aid of a grinding wheel, and ensuring that the actual grinding amount of each flat grinding of each surface of the acid-washing cold-rolled coil blank subjected to the leveling by the aid of the ground furnace pressure is consistent according to consumption rates of different materials, wherein the grinding amount is 0.3-0.4mm, the single grinding amount is 0.04mm, the grinding frequency is not more than 10 times, and the grinding speed is 1 min/time, so that the cold-rolled coil blank subjected to the flat grinding is obtained.
And adjusting the clearance of the abrasive belt machine to the thickness of the pure titanium plate in advance.
Sanding is sequentially carried out according to the sequence of (240 meshes-320 meshes) - (400 meshes-600 meshes) - (800 meshes-1000 meshes) - (1200 meshes-2000 meshes), each surface of the cold-rolled coil blank after flat grinding is sanded twice by adopting the same abrasive belt, and the sanding standard is as follows: the surface smoothness reaches Ra less than or equal to 0.3 mu m.
The medical high-performance TA3G pure titanium plate is prepared by the preparation method of the medical high-performance TA3G pure titanium plate, wherein the medical high-performance TA3G pure titanium plate is a finished product of a hot-rolled annealed finish-polished plate or a finished product of a cold-rolled annealed finish-polished plate.
Example 2
On the basis of the above examples, this example was conducted to produce a hot-rolled annealed pure titanium sheet TA3G having a thickness of 6 mm.
1. The grade-0 titanium sponge is selected as a main raw material, the grade-0 titanium sponge requires that C is less than or equal to 0.03 wt% and N is less than or equal to 0.01 wt%, and the trace element addition raw materials are TiO2 and TiFe 30.
2. TA3G pure titanium composition design: o ═ 0.13 to 0.18 wt%, Fe ═ 0.15 to 0.20 wt%.
Adding O to 0-grade titanium sponge to a target value (0.13-0.18) wt% (added in a TiO2 form) and adding Fe to a target value (0.15-0.20) wt% (added in a TiFe30 form), carrying out vacuum consumable melting on raw materials twice to obtain an ingot, and forging and mechanically adding the ingot to obtain a slab with the size of 200 × 1220 × 7000 mm.
3. And (2) charging the 200 × 1220 × 7000 slab into a furnace, heating in a stepping mode, wherein the heating temperature is 850-900 ℃, continuously heating for 220-240min, after the slab is taken out of the furnace, rolling and thinning the slab through a rolling type hot rolling mill, wherein 200 × 1220 × 7000 → 6 × 1220 ×L, when the slab is rolled to the thickness of 60-70, on the inlet side, an online temperature compensation device is involved to work, and the slab is continuously rolled to the thickness of 6 (the thickness is 6), so that a 6 × 1220 ×L hot rolled coil is obtained.
4. Uncoiling, online annealing, online shot blasting and pickling, and coiling to obtain a pickled hot-rolled coil blank, wherein the online annealing process system comprises the following steps: the heating temperature is (700-750) DEG C, and the heating lasts for (20-30) min.
5. Uncoiling, cutting to length, leveling by ground furnace pressure, and finishing (grinding/sanding/polishing) the surface to obtain a finished product of the hot-rolled and annealed finish-polished plate, namely the hot-rolled and annealed finish-polished TA3G pure titanium plate with the thickness of 6.
Referring to fig. 2 and fig. 3, the metallographic phase, the comprehensive properties and the yield of the TA3G pure titanium plate rolled in the roll form of the present invention are compared with those of the conventional rolled plate in the sheet form.
The hot-rolled annealed pure titanium sheet having a thickness of 6 and a finish-polished TA3G was subjected to phase transformation evaluation, and the rolled pure titanium sheet processed by the rolling method of the present invention was 6.0TA3G, and the longitudinal-section metallographic image (a) and the cross-section metallographic image (b) were obtained from FIG. 2(a) and FIG. 2 (b).
The longitudinal section of the conventional sheet type rolling processed 6.0TA3G pure titanium plate is in a gold phase diagram 3(a) and the cross section is in a gold phase diagram 3 (b). The sheet prepared by the method not only has high performance and consistency, but also has high surface quality, high dimensional accuracy and high production efficiency, and the cost is far lower than that of the sheet rolled sheet in the prior art, and the method is a revolution for processing the medical high-performance TA3G pure titanium sheet.
And evaluating the comprehensive performance and yield of the hot-rolled annealed finish-polished TA3G pure titanium plate with the thickness of 6. See table below.
| Rolling of the invention | Rolling of conventional sheet | |
| Tensile Strength Rm (MPa) | 611 | 589 |
| Yield strength Rp0.2(MPa) | 510 | 508 |
| Elongation (%) | 30 | 25 |
| Grain size (grade) | 10 | 8 |
| Yield (%) | 97％ | 90％ |
As can be seen from the above table, the hot-rolled annealed finish-polished TA3G pure titanium plate prepared by the preparation method of the medical high-performance TA3G pure titanium plate provided by the embodiment of the present invention is superior to a hot-rolled annealed finish-polished TA3G pure titanium plate prepared by conventional sheet rolling and having a thickness of 6 in terms of tensile strength rm (MPa), yield strength rp0.2(MPa), elongation (%), grain size (grade), and yield (%).
As can be seen from the above examples 1 and 2, the medical high-performance TA3G pure titanium plate and the preparation method thereof provided by the embodiments of the present invention have the following advantages:
1. and (3) hot rolling: although the method is characterized in that the coiling hot rolling is carried out by using a traditional stainless steel plate rolling mill, the thermoplastic processing temperature range of titanium is considered to be narrow, in order to prevent the problem of rolling tearing caused by the temperature drop of the surface of a plate in the rolling and thinning process, a temperature compensation device is additionally arranged on the inlet side of the hot rolling mill, the temperature parameter setting is consistent with the heating temperature, when the plate is rolled and thinned to about 1/3 of the thickness of an original plate blank, the temperature compensation device is positioned on a coiling platform through a mechanical lifting device, the temperature compensation is carried out through the temperature compensation device when the coiling is rolled back and forth, the dynamic elimination of processing hardening is realized, the plastic lifting of the material is realized, the thermoplastic rolling deformation is continuously realized, the actual maximum hot rolling plastic deformation of the TA3G pure titanium plate can reach 98 percent. A4-10 mm coiled belt can be obtained by hot rolling a plate blank with the thickness of 200mm with one heating, the one-heating forming efficiency is high, the processing loss is extremely low, the heat loss is about 0.5 percent, the heat loss is improved by 5 percent compared with the traditional sheet type rolling, and the processing cost is greatly reduced.
2. The plate is subjected to heat treatment by adopting on-line annealing, the TA3G pure titanium plate can obtain completely consistent grain size and mechanical property at the head and the tail, the consistency of the internal quality of the product is ensured, and the problem that the traditional stacking type annealing can not be completely annealed uniformly is avoided.
3. The annealed coil after hot rolling or cold rolling has good surface quality and small thickness tolerance range with the coil, the thickness tolerance of a hot-rolled coil of 4-10mm can be controlled within 0.2mm, the thickness tolerance of a cold-rolled coil of 1-4mm can be controlled within 0.1mm, and the plate tolerance band is improved by 1 time compared with that of a traditional sheet type rolling mode; the rolled tape blank of the small-thickness tolerance belt can be subjected to uncoiling, sizing, cutting, blanking, pressure leveling and finishing processing to obtain a medical TA3G pure titanium plate finished product with high performance and high surface quality.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A preparation method of a medical high-performance TA3G pure titanium plate is characterized by comprising the following steps:
obtaining a titanium plate blank;
heating the titanium plate blank to obtain a heated titanium plate blank; wherein the heating temperature is 850-900 ℃, and the heating duration is 220-240 min;
rolling the heated titanium plate blank to obtain a hot-rolled coil, wherein the thickness range of the hot-rolled coil is 4-10mm, and the width of the hot-rolled coil is 1220 mm;
uncoiling, online annealing, online shot blasting and pickling and coiling the hot rolled coil to obtain a pickled hot rolled coil blank; wherein the temperature of the on-line annealing is 700-750 ℃, and the annealing time is 20-30 min;
uncoiling, cutting to length, leveling under ground furnace pressure and finishing the surface of the acid-washing hot-rolled coil blank to obtain a finished product of a hot-rolled and annealed finish-cast plate;
rolling the acid-washed hot-rolled coil blank by using a coil cold rolling mill to obtain a cold-rolled coil, wherein the thickness range of the cold-rolled coil is 1-4mm, and the width of the cold-rolled coil is 1220 mm;
uncoiling, online annealing, online shot blasting pickling and coiling the cold-rolled coil to obtain a pickled cold-rolled coil blank; wherein the temperature of the on-line annealing is 700-750 ℃, and the annealing time is 20-30 min;
uncoiling, cutting to length, leveling under ground furnace pressure and finishing the surface of the acid-washed cold-rolled coil blank to obtain a finished product of a cold-rolled and annealed finish-polished plate;
and the finished product of the hot-rolled annealed finish-polished plate or the finished product of the cold-rolled annealed finish-polished plate is the pure titanium plate.
2. The method for preparing the medical high-performance TA3G pure titanium plate according to claim 1, wherein the step of obtaining the titanium plate blank comprises the following steps:
obtaining 0-grade titanium sponge; wherein, in the 0-grade sponge titanium, C is less than or equal to 0.03wt percent, and N is less than or equal to 0.01wt percent;
obtaining an addition raw material; the raw material addition comprises the following steps: TiO22And TiFe 30;
adding TiO into the 0-grade titanium sponge2The weight percentage of oxygen in the grade 0 titanium sponge is in the range of (0.13-0.18%) by weight according to the addition standard;
adding TiFe30 into the grade 0 titanium sponge, wherein the addition standard is that the weight percentage of iron in the grade 0 titanium sponge is in the range of (0.15-0.20%) wt; obtaining a mixed raw material;
performing twice vacuum consumable melting on the mixed raw materials to obtain an ingot;
and forging and machining the cast ingot to obtain a titanium plate blank.
3. The method for preparing medical high-performance TA3G pure titanium plate according to claim 1, wherein the titanium plate blank has a thickness of 200mm, a width of 1220mm and a length of 7000 mm.
4. The method for preparing medical high-performance TA3G pure titanium plate according to claim 3, wherein the step of rolling the heated titanium plate blank to obtain the hot-rolled coil comprises:
carrying out primary rolling on the heated titanium plate blank by using a roll type hot rolling mill to obtain a primary rolled piece, wherein the thickness of the primary rolled piece is 60-70mm, the width of the primary rolled piece is 1220, and the length of the primary rolled piece is 7000;
carrying out secondary rolling on the primary rolled piece through a roll type hot rolling mill, and in the process of the secondary rolling, utilizing an online temperature compensation device to compensate the temperature of the inlet side of the roll type hot rolling mill; and after the second rolling is finished, obtaining the hot rolled coil.
5. The method for preparing the medical high-performance TA3G pure titanium plate according to claim 1, wherein the surface finishing steps are flat grinding and sanding.
6. The method for preparing the medical high-performance TA3G pure titanium plate according to claim 5, wherein the step of surface finishing processing of flat grinding and sanding comprises the following steps:
fixing a vacuum sucker on a flat grinding reference platform in advance, ensuring that the upper reference surface of the vacuum sucker is kept horizontal, and paving a rectangular circle of vacuum sealing rubber strips in a field-shaped lattice gap belt of the upper reference surface of the sucker according to the size close to the length and the width of a plate;
placing the acid-washed cold-rolled coil blank subjected to pressure leveling in the ground furnace on the reference surface of a vacuum chuck, ensuring that the sealing rubber strips are completely covered, keeping the four sides equidistant, starting the vacuum chuck to work, evacuating to the maximum adsorption force, and completely adsorbing and compacting the acid-washed cold-rolled coil blank subjected to pressure leveling in the ground furnace and the reference surface;
starting a flat grinding grinder to work, carrying out flat grinding cutting processing on the surface of the acid-washed cold-rolled coil blank subjected to leveling by virtue of the ground furnace pressure by virtue of a grinding wheel, and ensuring that the actual grinding amount of each flat grinding of each surface of the acid-washed cold-rolled coil blank subjected to leveling by virtue of the ground furnace pressure is consistent according to the consumption rates of different materials, wherein the grinding amount is 0.3-0.4mm, the single grinding amount is 0.04mm, the grinding frequency is not more than 10 times, and the grinding speed is 1 min/time, so as to obtain a cold-rolled coil blank subjected to flat grinding;
adjusting the gap of the abrasive belt machine to the thickness of the pure titanium plate in advance;
sanding is sequentially carried out according to the sequence of (240 meshes-320 meshes) - (400 meshes-600 meshes) - (800 meshes-1000 meshes) - (1200 meshes-2000 meshes), each surface of the cold-rolled coil blank after flat grinding is sanded twice by adopting the same abrasive belt, and the sanding standard is as follows: the surface smoothness reaches Ra less than or equal to 0.3 mu m.
7. The medical high-performance TA3G pure titanium plate is characterized by being prepared by the preparation method of the medical high-performance TA3G pure titanium plate as claimed in any one of claims 1 to 6, wherein the medical high-performance TA3G pure titanium plate is a finished product of a hot-rolled annealed finish polished plate or a finished product of a cold-rolled annealed finish polished plate.
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